Speed-reducing gearing.



a. IJATHIVIAN. SPEED REDUCING GEAIIII'IG. APPLICATION FILED IAN-13.1917

%553; E} Patented July II), 1917i.

ran. a it i GILBERT na'rnataic, on NEW YORK, n. Y.

I srnnn-nnniiczno o Specification tea-n5 Patent.

\ iPatented July Ml, llii ll.

Application filed January 13,1917. Serial No. 142,218.

To 117! whom it'niay concern:

lie it known that l, Giminnr dent of the borough of lllanhattan, city, county. and State of New York, have invented certain new and useful Improve 'ments in Specddleducing Gearing, of which the 't'ollowingr is a specilicatirm.

This invention relates to im 'irovenients in that type of specd reducing gearing;- known as eccentric differential reduction gearing, in which an internally toothed gear atliXed to thc-driven shaftgis driven by means of an annular rack held in constant mesh with the aforesaid gear and caused to gyrate within the same, this annular rack being held against rotation on its-own axis and having; a gyratory movement imparted to it by means of an eccentric atiixed to the driving shaft, means being" provided for preventing the annular rack and its eccentri --strap, to which it is rigidly attached, from rotating on their own axes.

I The object of my invention is to pro- ,vide an extremely simple and strong gear of the type set forth, so constructed that irregular or jerky motion of the annular .driving rack is eliminated, and perfect meshing of the teeth of the rack with the teeth of the internal driven gear 1s msured,

to the end that the driven shaftv shall have i a smooth, even, regular movement imparted thereto.

In the drawing, Figure 1 is a vertical longitudinal section;

Fig. 2 a vertical section on the line 2-2 of Fig. l; and Fin. 4 a vertical section on the line 3-3 of Fig. 1, showing a perfect embodiment of my invention;

l 3 and 53 are views similar to Fig. 4, showing modified embodiments of the invention.

Referring to the various parts by numerals. l0 designates the slow-speed or driven shaft airrying the internal gear 11, and 12 designates the high-speed driving" shaft carrying the eccentric 13 and having its inner end journaled in a central recess 14 in the body of the internal gear, the object of thus supporting the inner end of the driving shaft on the driven shaft being to insure exact axial alinement of these shafts and tints at all times maintain the parts in their proper mechanical relation.

On the eccentric is mounted a strap 15, and rigidly af'ixed to this strap is the annu- RATHMAN, a citizen of the United States, and a reslof the internal gear.

tively shifting the anchoring member by eccentric strap is an anchoring or guiding member 17 whose outer end is bifurcated so as to embrace an eccentric 18 atlixed to a o stub shaft 19,.this eccentric being an exact companion to the eccentric 13. The stub shaft is driven through the medium of a pair of gears 20 and 21; one being attired. to the driving; shaft and "the'other to a stub shaft.

It will be observed that the ro" the driving shaft through the medi the eccentric 13 bodily rotates the rack or gear 16, lrcepiiug it always with the internal gear, and that this ra is prevented from axial rotation by means of the anchoring and. guiding member thus positively driving the internal a slower speed than the driving; shaft, the Z5 dill'erence in speed being; determined by the ditference in diameter between the pitch line of the annular rack and the pitch line The engaging of the anchoring member 17 with an eccentric so which is an exact duplicate of the main ec centric 13. and the driving! of this supplemental ccccntric positively from the driving shaft. not only permit the necessary free radial movement of the anchoring member, but also bring about a positive lateral shifting of the anchoring end of the 'acl\:-carrying: member in exact unison with the end thereof which is mounted on the main eccentric. thereby at all times maintaining the anchoring member in a radial position or in a position exactly parallel thereto. The especially unique feature in my device lies in the fact that I provide means for posimeans driven from one of the shafts, so that all faulty operation due to the inexact meshing of the annular rack with the internal gear will be completely obviated, thus insuring an even and regular rotation of the internal gear and a smooth, continuous revolution of the slow-speed driven shaft.

lt is obvious that my invention may be :arried out by a variety of mechanisms, all of which come within thescope of my claims. In Fig. 3 I show the use (if an intermediate idle gear 22 for connecting the two gears 20 and 21, whereby the gears 20 and 21 are driven in the same direction, the two eccentrics 13 and 18 being rearranged accordingly. In this form of the apparatus the ohter end of 'the anchoring member is be positively given a movement in exact unison with the inner end of the anchoring member. l/Vhat I claim is: Y 1. In a gearing of the class set forth, a

driven shaft, an internal gear fixed to said driven shaft, a driving shaft, a pini 1.1 fixed on the driving shaft, a gyratory gear meshing with the internal gear, means fixed on the driving shaft whereby said gyratory gear is gyrated, a counter shaft, a pinion fixed on the counter shaft and meshing with the, pinion on the driving shaft, and means operated by the driving shaft through the medium of said pinions for holding the gyratory gear against axial rotation.

2.-In a gearin of the class set forth, a driven shaft, an internal gear fixed to said driven shaft, :1 driving shaft, a pinion fixed on the driving shaft, a gyratory gear meshing with said internal gear, means fixed on 5 the driving shaft for gyrating the gyratory gear, an anchoring'member connected at one end with said gcar-gyrating means, a counter shaft,a pinion fixed on the counter shaft and meshing with the pinion on the driving shaft, and means driven from the driving shaft through said pinions operatively connected with the opposite end of said anchoring member for positively shifting and guiding said anchoring member to hold the gyratory gear against axial rotation.

3. In a gearin of the class set forth, a driven shaft, an internal gear fixed to said driven shaft, a driving shaft, an annular driving rack meshing with the internal gear, an eccentric carried by the driving shaft, a counter-shaft, a pinion fixed on said counter-shaft, a pinion fixed on the driving shaft and meshing with the pinion on the counter shaft, a supplemental eccentric carried by the counter-shaft, and means operated by mental eccentric engaging the anchoring member and having the same throw as the eccentricv carried by the driving shaft, and means for. positively rotating the supplemental eccentric through the medium of the driving shaft.

5. In a gearing of the class set forth, a driven shaft, an internal gear fixed to said driven shaft, an annular driving rackmeshing with said internal gear, a driving shaft,-

an eccentriccarried by the driving shaft, a strap mounted on said eccentric and rigidly affixed to the driving rack, an anchoring member connected to said strap, a supplemental eccentric engaging the anchoring member and having the same throw as the eccentric carried by the driving shaft, and means for positively rotating the supplemental eccentric through the medium of the driving shaft, said driving shaft having on end journaled in and supported by the adjacent end of the driven shaft.

In testimony whereof I hereunto aflix my signature.

GILBERT RATHMAN. 

